Pump.



T. E.'-GHERRY. PUMP.

APPLIOATION FILED MAY 7. 190s.

.91 8,007. Patented Apr. 13, 1909.

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UNITED STATES PATEN T OFFICE.

THOMAS E. CHER-RY, OF REVERE, MASSACHUSETTS.

PUMP.

Application filed May 7, 1908.

To all whom it may concern.'

Beit known that l, THoMAs E. CHERRY, of Revere, in the county oi' Suffolk and State of Massachusetts, have invented certain new and useful improvements in Pumps, of which the following is a specification.

This invention relates to pumps for circulating Water, although it may be used for raising or circulating other liquids, or even air, or other gaseous fluids.

The object of my invention is to provide a simple, compact and eiiective pump which will sup ily steady and continuous stream, or, circulation, only an absolutely even application of power being necessary to operate the pump.

To this end my invention consists in a pump having a circular series of parallel cylinders and pistons surrounding a central duct for the fluid, the said duct communicating with the cylinders, the pistons being operated successively or one folloving the other, in rotation.

My invention further consists in subordinate improvements, as will be more fully hereinafter described and claimed.

Of the accompanying drawings in which similar reference characters indicate the saine or similar parts in all of the iigures:- Figure 1 represents a partial elevation, and partial longitudinal section of a pump einbodying my improved construction. Fig. 2 represents a section through the pump on the line 2 2 of Fig. 1. Fig 3 represents a detail section on line 3-3 of Fig. 1. Fig. fi represents a different arrangement of valve mechanism hereinafter explained.

A circular casing 10, supported on a suit able base 11, has its middle portion between its ends bored or otherwise constructed to form a plurality or series of cylinders 12, said cylinders being parallel with each other and with the longitudinal center of the casing and equidistant from the said longitudinal center.

One end of the casing (the left-hand end in Fig. 1) is externally reduced in diameter to.

form an extension 13. The extension 13 may be integral with the portion 10, but for convenience of manufacture it is separate from, but secured to the portion 10 by suit able means, such as bolts 14.

On the extension 13, is mounted a pulley 15 through the medium of which the pump is driven. The said extension 13 contains Within it a cam hub 16 Which-is formed With a cam groove 17, said hub 16 being connected Specification of Letters Patent.

Patented April 13, 1909.

Serial No. 431,485.

to the pulley 15 so as to be rotated by it as best shown in Fig. 2. The cani hub 16 fits closely Within the casing extension 18, and the latter is formed with a series of internal longitudinal grooves 18 which receive and guide the piston rods 19 of the pistons 2O which latter are Amounted and reciprocate in the cylinders 1.2, the pistons 2O being, oi course, provided With suitable packing, as shown in Fig. 1. Each piston rod is provided With a pin 21, preferably provided With a roller, and entering the cani groove 17. As will novv be readily understood, when the pulley 15 is rotated as by means of a belt driven by hand or any suitable motor, the hub 16 is rotated so that this groove causes the piston rods and pistons to reciprocate in their cylinders, their motion being such that they follow each other 'ni succession. In the puinp, illustrated in the drawings, there are seven cylinders and pistons and consequently there will always be at least two of them moving in the same direction, one behind the other in order oi operation.

Leading into the end of the casing, opposite tie pulley, is an inlet 22, the said inlet connecting with a chamber 23 formed in the end Wall oi' the casing. The said end Wall 24 is formed With as many ports 25 as there are cylinders, said ports connecting the chamber 23 With 'passages 26, each of the latter being connected at 27 with a cylinder 12. A port 28 opposite each cylinder 1.2 connects With a central chamber 29 Which latter connects with the central duct for the outflow, of the fluid. Each port 25 is provided with a valve 31 which valve is seated by a spring 32. Each port 28 is furnished with a valve 33, seated by a spring 34. A pin 35 has its ends projecting toward the ports 25 and 2S, the valves being mounted to slide on said ends. Said valves are also preferably provided with guide pins 86 which enter the ports.

In operation the rotation of the pulley 15 causes the cani to actuate the pistons in 'succession, each piston drawing in fiuid through the inlet 22, port 25 and passage 26, and opening 27 into the cylinder. Then on the return of the piston the fluid is ejected from the cylinder and through. the port 28 into the chamber 29 and through the outlet or central duct 30, the tWo vvalves for each cylinder opening and closing alternately under the influence of the fluid pressure and of the valve springs.

Owing to the fact that the outlet coinprises a duct Which is central relatively to the circular series of parallell cylinders and pistons, the inechanisrn ofthe punip iske t cool by the fluid being pumped, especially when the latter is Water. rl`he resistance to the p9ufer employed in operating the punip is absolutely uni'lorin because of the nuinber of cylinders and pistonsV employed, all 'of which follow each other, or operate in succession.

I have' shown in Fig. 4 an arrangement ol the valve'inechanisi'n to be substituted for that shown in 1,-"Wliich is inore `eleotive When pun'iping air, as the spacebetween the inlet'valvesand the pistons is reduced to the ininini'uin. To vthis end I provide 'the end Wall 24, having the'inlet 25, and valves Ll0 and outlet valves Lll, and attach the saine to the casing 10 by bolts 14.

I'clainiz- 1. In a'punip, a stationary solid casing having a circular vseries ol parallel cylinders lornied therein, pistons in said cylinders and having `piston rods, a hub rotatively inounted 'in the s'pacebetween said piston rods and hayinga cani, o )ei'ative connections between said cani and' tliei'iiston'rods, and a pulley surrounding the piston rods and-operatively connected'with the cani hub. i

2. 'In a puinp, 'a stationary solid casing having a circular series oi' parallelcyliiiders -l'orined therein, and havinga cylindrical'enm tension at one side,'a pulley-mounted on said extension, a cani hub Within said extension and operatively connectedu'ith'said pulley, an'dpistons in' said cylinders, saidpis'to'ns having rods projecting bet-Ween 'tne said eX- tension of 'the casing and the Cain `hub and operatively' connected *itlr the latter.

In a puinp, a stationary solidcasing having a circular series ol' parallel cylinders 'forin'ed therein, and having'a cylindrical eX- tension at one side, said extension'having a series of internal longitudinal grooves, a pulley inounte'd on said extension, a' cain hub siepe? Within saideXt-en'sion and operatively connected with rsaid pulley, and pistons in -said cylinders, said 'pistons having rods fitting the internal grooves of said extension ofthe casing-and operatively connected With the latter.

4. A pump coniprising a casing having a circular series of parallel cylinders and pistons, a pulley mounted on said casing, a hub locatedbetween said pistons and having a cani groove, said hub being operatively connected'With'saidpulley, the said pistons having their rods provided With pins entering said cani groove, a central longitudinal outlet duct extending bet-Ween the operating parts of the punipand serving-to cool the saine,

and valved inlet and outlet ports for said cylinders. Y

"let duct extending between the operating parts oi the punip `and serving to cool thesaine, a valved ort leading from each cylinderto said out et duct, and nieans for supplying fluid to said cylinders.

6. A puinp comprising a casing having a I circular series of paralle cylinders and pistons, a 'pulley mounted on said casing, ahub located -betweensaid pistons and having a cani groove, said hub being operatively connected with said pulley, the said pistons havingitheir rods provided with pins entering said cani groove, a central longitudinal out- -let duct extending between'the oneratinv- D .L b

parts oi' the puinp and serving to coolthe saine, a valved port leading -from each cylinder to said outlet'duct, a single inlet, and a valved port leading from said inlet to each cylinder. i

In testimony whereof I have ai'hXed my signatui-e, in presence of two Witnesses.

THOMAS n.' CHERRY.

vWitnesses:

C. FuBnoWN, P. W. PEZZETTI. 

